Dynamo-electric machine.



B. G. LAMME.

. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN.26.1910.

Patented Aug. 17, 1915.

4 SHEETS-SHEET B. GI LAMIVIE. I

DYIIAIYIO ELECTRIC MACHINE.

7 APPLICATION FILED JAN. 26. I950.

Patented Aug. 1?,1915.

4 SHEETS-SHEET].

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ATTORNEY WITNESSES:

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B. G. LAMME.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN. 26, I910.

Patented A11 17, 1915.

4 SHEETS-SHEET 3.

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INVENTOR AkYORNEY B. G. LAM ME.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JAN. 26,1910.

Patented Aug. 17, 1915.

.4 SHEETS-"SHEET 4- WiTNESSES:

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NVENTOR N TED BENJAMIN G. LAMME, 0F PITTSBURGH, PENNSYLVAI ELECTRIC AND TMANUFACTUEING GOlvElAT-JY, A 695,1 0:

DYNAMO-ELECTREC Iii! 5H woeee,

To all whom it may concern Be it known that I, BENJAMIN G. LAMME, as citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have in- .ventecl a new and useful Improvement in Dynanio-Electric Machines, oi which the following isa specification.

My invention relates to dynamo-electric machines, and particularly to the wi, l s thereof and means'for supporting the The object of my inventionis' to provi e:

table members.

The end portions of the rotatable members of dynamo-electric machines have heretofore been commonly secured against (lisplacement, by means of wire lands, cylindrical shells, or end bells. However, the use of bands in large machines is objection able, because of the necessity of rrnwving and replacing the same in their entirety in order to repair a single inji'lreclcoil, and cylindrical shells or end bells are olr iectionable, not only for the same reason, but because they are usually unduly expensive, and because it i's very Cliilicult to lit them closely over the end portions o l the Winding, which, of course, is necessary in order that they may he ell'octive. End bells also n1aterially interfere with the ventilation of the winding and other parts of the 1nachine.

It has been proposed further to employ segmental clamping rings forsecuring the =end portions ot the windings to supports therefor, but such means have not been gen erally empl yed because spaces could not be provided between the coils at convenient and suitable locations for clamping bo ts or devices.

According), to the pr ent inventiom the coils of the main win( 5; are disposed in groups that are spaced apart to provide opci'iings through which extend the ell-"imp Zing bolts or for securing the portions of the Winnings to supp th for. The spec t coil groups renders it expetl e t to employ an (11min winding for ell'c o belanr within the machine, the s. auxiliary wintlin spaces oetween he main "winding. T: hahmcing;

raa i in; current to employ on so desired to effect t uc (.li' eason that it has ire- Q seldom practicable reior in the cores of displace pect to the are extremelv sma as ernaring an slight eccentric I .r ativcly movable z olto each other unb: lancecl pull, unless some ecting' equalization thereof is .11 the secondary windii 's squ rel cage type. a certa. 1 c ordination is naturally obtainerh ly being suliicicnt in practire to accomplish the necessary or dcsire occur. es ecially :21; slow is but a very sli aren'ient between ti; o Mary members. in

being that a very great large machines, therefore, the use of equalizing windings is not only highly desirable but quite necessary, and one of the objects of the present invention is to render it practicable to employ them.

In the accompanying drawings, Figure 1 is an end view of a partof the secondary 'member of an induction motor that embodthat is mounted upon the periphery of a' spider 2 and. is clamped between two end plates 3 and 4 that are keyed on, or otherwise suitably secured to, the spider. The core 1 is provided with peripheral slots that contain the windings, the main winding comprising a plurality of spaced groups of coils 5, the straight side portions of which occupy the core slots, except the slots between the coil groups. The coils 5 are arranged, as usual, in superposed layers, and the end portions thereofare of V-shape-and are inclined to the straight side portions. The spaces between the groups of coils are maintained in the end portions thereof, and it will accordingly be obvious that, at the points where the spaces between the groups of coils in the upper and lower layers cross each other, there are openings extending entirely through the end portions of the wind- The V-shapedend portions of the coils 5 are supported upon segmental brackets (l and are clamped upon the same by segmental rings 7 and bolts 8 that extend through the openings provided in the end portions of the windings at the crossings of the spaces between the coil groups of the superposed layer of coils. The segments of the 'retaining rings 7 are curved plates thatare arranged end to end, and the end edges of which are inclined to their side edges at substantially the same angles as the end portions of the coils are inclined to the side portions thereof. The said plates are placed upon the coils so their end edges arepa rallel to the portions of the coil ends that are in the inner layer, the effect of overlapping retaining means being thus obtained.

The openings through the end portions of the winding occur at such points that the retaining ringsmay be placed approximately midway between the core 1 and the extremities of the coils; that is, where they are most effective, and since the rings are segmental,

no dilliculty is experienced in securely clamping all of the coils upon the supporting brackets. he segmental retaining rings also permit of removing or repairing an injured coil with the disturbance of but a small number of other coils and without removing the said rings as a whole. The spaces between the coil groups also permit of better ventilation of the coils and core, and also effect an improvement in the insulation by providing a greater distance between the coils belonging to dillerent phases.

The slots in the core that lie between the groups of coils of the main winding are partially occupied by cross conductors 10 of an auxiliary or equalizing winding, that comprises 2 single end ring 11 to which one end ofall of the cross conductors are connected, anda plurality of end rings 12, 13, 14, 15, 1(5 and 17 to which the other ends ot the cross conductors are connected, in succession. The end ring 11 is secured to the end plate l, and the end rings 12 to 17, inclusive, are insulated from each other and secured to the end plate 3 and the spider 2. In the present instance, the main winding has three phases, and there are three groups of coils per pole, with three intervening slots in which the cross conductors 10 ot the auxiliary winding are located. Only the cross conductors oi normally equal potential are connected to the same rings of the sets 12 to 17, inclusive, so that no currents traverse the auxiliary winding as a result of currents in the primary winding unless there is a iion-unii ormity ol the magnetic licld in which the secondary member rotates, which iion-uiiit'orn'iity may be caused either by eccentricity of the primary and secondary members with respect to each other, or by other irregularities. However, when currents do traverse the auxiliary winding, they serve to effect a balancing or equalizing of the magnetic field and the pull exerted thereby.

\Vliile, as shown, there are two cross-conductors and end connecting rings for each phase of the machine and there are as many groups of coils per pole of the main winding as there are phases of the machine, it is obvious that the invention is not limited to such a specific arrangement, but that any desired number of groups of coils in the main winding may be employed, as well as any desired number of cross-conductors and- 1. In a dynamo-electric machine, the com bination with a winding comprising a plurality of spaced groups of coils having projecting ends also disposed in spaced groups; of an internal support for said projecting bination with u ding comprising project through c 1e spaces certain end portions of the coils 'bination with 'a slotted cor one (1 ends, external rings, and ciain group ends 2. In a dynamo-cl ctric machine, thecom-- bination with a winding coin} 3risin-- rality of spaced groups of coils harm jecting also disposed n of a coil supp? t, retain means that project throughv s tween the coil group ends and clai coils between said. supports ing plates.

3. in a d namo-electric in "bination w a winuin rality of spaced groups of t -shape, of a coil plates the ends at parallel to one side of the end poi l cthe coils, and means that project through the spaces between the, coil. gran clamp the coils between the and retaining pla' s.

4. in a dynamyrelectric mac bination with a. winding compr, rality oi spaced groups of overla having projecting ends also posed in spaced groups, of a coil support, and re taining plates intermediately disposed with reference to said projecting" ends, means that project througa the spaces between the coil groupends and clamp the coils between the said support and retaining plates.

5. in a dynamo-el I niachine, the combination with a slotted core, and a winding comprising plurality of spaced groups of coils occupying the core slots except between the coil groups and having; projccting ends also disposed in spaced groups, of a coil support, and means for clamping the pro ecting coil ends to the support, said means comprising intermediately disposed plates and bolts that project through the spaces between the coil group ends.

6. In adynaino electric. machine, the combination with a winding comprising a plu rali ty of coils, of a. segmental clamping ring forthe ends of the coils, the abutting en is of the segments being inclined the thereof to correspond to the inclination "of Va l spect to their intern'iedic-te portions,

-'i'. in a dynamo electric i'uachine, the coin a plurality of coils haying it-shaped end portions, of a segmental clamping ring for the suit end portions of the coils, the abu" 1 ing ls oi the segments beis inclined to the uise thereof and substantially para lcl with certain end portions of the coils,

8, ln a dynamo-electric machine, the oinwinding comprising a plurality of spaced groups of coils occupying the core slots except between the coilgroups, of internal and external coil-supporting members clamping .cept between the coil groups, there being as many groups of the said coils and intervening core slotsper pole as there are phases of the machine, of an auxiliary closed circuit winding that occupies the coref'slots between the coil groups.

dynamo-electric machine, the

10. In a combination with a slotted core, and email! winding comprising a plurality of spaced groups of coils occupying the slots exceptbctween the coil groups, of an auxiliary winding having cross-conductors occupying the core slots between the said coil groups, ring at one end of the core connected to all of said cross-conductors and rirlgs at the other end of the core respectively connected to only certain oi the crossconductors.

11. In a dynamo-electric machine, the combination with a slotted core and a main winding comprising a. plurality of spaced groups of coils occupying the core slots except between the coil groups, of an auxiliary winding. comprising cross conductors occupying the core slots between the said coil groups, a conductor connected to oneend of all of the cross-conductors, and twice as many conductors as there are phases of the machine connected to the crossconductors at their other ends.

12. In a dynamo-electric machine, the combination with a slotted core and a winding comprising a plurality of spaced groups of coils occupying the coil-slots except between the coil groups, of an auxiliary Winding comprising cross-conductors occupying the core slots between the said coil'groups, a conductor connected to one eid'of all 0 the cross-conductors at their other ends. p

13. In a dynamo-electric machine,;. the combination witha main winding comprising as many spaced groups of coils per pole of the machine as there are phases thereof, of an auxiliary closed circuit winding comprising crossconductors occupying the spaces between the coil groups, and end connections to the cross-conductors.

14:. In a dyn amoelectric machine, the combination with a main winding comprising as many spaced groups of coils per pole of the machine as there are phases thereof, of an auxiliary closed circuit winding acct-1 j pying the spaces between the coil groups.

15. in a dynamo-electric machine, the combination with awinding comprising a plurality of spaced groups of overlapping f; coils the ends of WhlCl'I'CI'OSS each other, of v.

an annular supporting member that enga i lwl the inner faces of intermediate portions of v the coil ends, and means for clamping the coil ends to said member, said means comprising asegmental ring that engages the outer faces of said intermediate portions and bolts that proJect through the spaces between the coil-end groups where the said spaces cross each other.

BENJ. G. LAMME.

Witnesses:

E. Livixes'roxn,

B. B. I'IINES. 

